Side rail



FIG. 1 is a top, front, right side perspective view of the side rail of the present design;

FIG. 2 is a top, front, left side perspective view thereof;

FIG. 3 is a bottom, front, left side perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a right side view thereof; and,

FIG. 9 is a left side view thereof.

The broken lines illustrate portions of the side rail which form no part of the claimed design. 

CLAIM The ornamental design for a side rail, as shown and described. 